Question

The following table shows the position of five elements A, B, C, D and

E in the modern periodic table.

Answer the following giving reasons:

(i) Which element is a metal with valency two?

(ii) Which element is least reactive?

(iii) Out of D and E which element has a smaller atomic radius?

3

32

a. Explain the formation of Calcium Chloride with the help of electron

dot structure. (At numbers: Ca = 20; Cl = 17)

b. Why do ionic compounds not conduct electricity in solid state but

conduct electricity in molten and aqueous state?

3

33

Refractive index of water with respect to air is 1.33 and that of diamond

is 2.42.

(i) In which medium does the light move faster, water or diamond?

(ii) What is the refractive index of diamond with respect to water?

3

Section D

34

Match the following pH values 1, 7, 10, 13 to the solutions given below:

 Milk of magnesia

 Gastric juices

 Brine

 Aqueous Sodium hydroxide.

Amit and Rita decided to bake a cake and added baking soda to the

cake batter.

5

Group

→

Period

1
​

Answer 1

Answer:

Guiegyoot476w773eyyeuhwfue